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22 February, 10:08

Ben rolls two standard number cubes 36 time. predict how many time he will roll a sum of four.

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  1. 22 February, 10:35
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    You can make a 6 x 6 square to illustrate the probabilities

    1 2 3 4 5 6

    1 2 3 4 5 6 7

    2 3 4 5 6 7 8

    3 4 5 6 7 8 9

    4 5 6 7 8 9 *

    5 6 7 8 9 * &

    6 7 8 9 * & $

    * = 10, & = 11, $ = 12, I wanted maintain spacing

    There are 3 4's. So it is 3/36 chance, which is 1/12 chance.
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